A week ago my check engine soon light came on also. It does have an intake that was put on about a month ago though, so I'm figuring it was that. I hope.

 

ok well i just got back from washington dc and when i got in my car to go get it checked at Auto Zone the light was off so i guess everything is ok.

 

Yeah, with all the crazy things that the computer (average speed, mpg, etc) on the 350z has youd think it would let you read the codes it throws. My SRT-4 had the cycle the ignition 3 times to read codes thing, was amazing, I never threw any codes but it was nice knowing it was there. SRTForums.com had a database with the meanings for all the codes so if you ever threw one you could find out for yourself.